1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
5 #include <asm/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/ftrace.h>
11 #include <trace/boot.h>
14 __TRACE_FIRST_TYPE
= 0,
38 * The trace entry - the most basic unit of tracing. This is what
39 * is printed in the end as a single line in the trace output, such as:
41 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
47 unsigned char preempt_count
;
53 * Function trace entry - function address and parent function addres:
56 struct trace_entry ent
;
58 unsigned long parent_ip
;
61 /* Function call entry */
62 struct ftrace_graph_ent_entry
{
63 struct trace_entry ent
;
64 struct ftrace_graph_ent graph_ent
;
67 /* Function return entry */
68 struct ftrace_graph_ret_entry
{
69 struct trace_entry ent
;
70 struct ftrace_graph_ret ret
;
72 extern struct tracer boot_tracer
;
75 * Context switch trace entry - which task (and prio) we switched from/to:
77 struct ctx_switch_entry
{
78 struct trace_entry ent
;
79 unsigned int prev_pid
;
80 unsigned char prev_prio
;
81 unsigned char prev_state
;
82 unsigned int next_pid
;
83 unsigned char next_prio
;
84 unsigned char next_state
;
85 unsigned int next_cpu
;
89 * Special (free-form) trace entry:
91 struct special_entry
{
92 struct trace_entry ent
;
102 #define FTRACE_STACK_ENTRIES 8
105 struct trace_entry ent
;
106 unsigned long caller
[FTRACE_STACK_ENTRIES
];
109 struct userstack_entry
{
110 struct trace_entry ent
;
111 unsigned long caller
[FTRACE_STACK_ENTRIES
];
115 * ftrace_printk entry:
118 struct trace_entry ent
;
124 #define TRACE_OLD_SIZE 88
126 struct trace_field_cont
{
128 /* Temporary till we get rid of this completely */
129 char buf
[TRACE_OLD_SIZE
- 1];
132 struct trace_mmiotrace_rw
{
133 struct trace_entry ent
;
134 struct mmiotrace_rw rw
;
137 struct trace_mmiotrace_map
{
138 struct trace_entry ent
;
139 struct mmiotrace_map map
;
142 struct trace_boot_call
{
143 struct trace_entry ent
;
144 struct boot_trace_call boot_call
;
147 struct trace_boot_ret
{
148 struct trace_entry ent
;
149 struct boot_trace_ret boot_ret
;
152 #define TRACE_FUNC_SIZE 30
153 #define TRACE_FILE_SIZE 20
154 struct trace_branch
{
155 struct trace_entry ent
;
157 char func
[TRACE_FUNC_SIZE
+1];
158 char file
[TRACE_FILE_SIZE
+1];
162 struct hw_branch_entry
{
163 struct trace_entry ent
;
169 struct trace_entry ent
;
170 struct power_trace state_data
;
174 * trace_flag_type is an enumeration that holds different
175 * states when a trace occurs. These are:
176 * IRQS_OFF - interrupts were disabled
177 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
178 * NEED_RESCED - reschedule is requested
179 * HARDIRQ - inside an interrupt handler
180 * SOFTIRQ - inside a softirq handler
181 * CONT - multiple entries hold the trace item
183 enum trace_flag_type
{
184 TRACE_FLAG_IRQS_OFF
= 0x01,
185 TRACE_FLAG_IRQS_NOSUPPORT
= 0x02,
186 TRACE_FLAG_NEED_RESCHED
= 0x04,
187 TRACE_FLAG_HARDIRQ
= 0x08,
188 TRACE_FLAG_SOFTIRQ
= 0x10,
189 TRACE_FLAG_CONT
= 0x20,
192 #define TRACE_BUF_SIZE 1024
195 * The CPU trace array - it consists of thousands of trace entries
196 * plus some other descriptor data: (for example which task started
199 struct trace_array_cpu
{
202 /* these fields get copied into max-trace: */
203 unsigned long trace_idx
;
204 unsigned long overrun
;
205 unsigned long saved_latency
;
206 unsigned long critical_start
;
207 unsigned long critical_end
;
208 unsigned long critical_sequence
;
210 unsigned long policy
;
211 unsigned long rt_priority
;
212 cycle_t preempt_timestamp
;
215 char comm
[TASK_COMM_LEN
];
218 struct trace_iterator
;
221 * The trace array - an array of per-CPU trace arrays. This is the
222 * highest level data structure that individual tracers deal with.
223 * They have on/off state as well:
226 struct ring_buffer
*buffer
;
227 unsigned long entries
;
230 struct task_struct
*waiter
;
231 struct trace_array_cpu
*data
[NR_CPUS
];
234 #define FTRACE_CMP_TYPE(var, type) \
235 __builtin_types_compatible_p(typeof(var), type *)
238 #define IF_ASSIGN(var, entry, etype, id) \
239 if (FTRACE_CMP_TYPE(var, etype)) { \
240 var = (typeof(var))(entry); \
241 WARN_ON(id && (entry)->type != id); \
245 /* Will cause compile errors if type is not found. */
246 extern void __ftrace_bad_type(void);
249 * The trace_assign_type is a verifier that the entry type is
250 * the same as the type being assigned. To add new types simply
251 * add a line with the following format:
253 * IF_ASSIGN(var, ent, type, id);
255 * Where "type" is the trace type that includes the trace_entry
256 * as the "ent" item. And "id" is the trace identifier that is
257 * used in the trace_type enum.
259 * If the type can have more than one id, then use zero.
261 #define trace_assign_type(var, ent) \
263 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
264 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
265 IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
266 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
267 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
268 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
269 IF_ASSIGN(var, ent, struct special_entry, 0); \
270 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
272 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
274 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
275 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
276 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
277 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
279 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
281 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
282 IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
283 __ftrace_bad_type(); \
286 /* Return values for print_line callback */
288 TRACE_TYPE_PARTIAL_LINE
= 0, /* Retry after flushing the seq */
289 TRACE_TYPE_HANDLED
= 1,
290 TRACE_TYPE_UNHANDLED
= 2 /* Relay to other output functions */
295 * An option specific to a tracer. This is a boolean value.
296 * The bit is the bit index that sets its value on the
297 * flags value in struct tracer_flags.
300 const char *name
; /* Will appear on the trace_options file */
301 u32 bit
; /* Mask assigned in val field in tracer_flags */
305 * The set of specific options for a tracer. Your tracer
306 * have to set the initial value of the flags val.
308 struct tracer_flags
{
310 struct tracer_opt
*opts
;
313 /* Makes more easy to define a tracer opt */
314 #define TRACER_OPT(s, b) .name = #s, .bit = b
317 * A specific tracer, represented by methods that operate on a trace array:
321 /* Your tracer should raise a warning if init fails */
322 int (*init
)(struct trace_array
*tr
);
323 void (*reset
)(struct trace_array
*tr
);
324 void (*start
)(struct trace_array
*tr
);
325 void (*stop
)(struct trace_array
*tr
);
326 void (*open
)(struct trace_iterator
*iter
);
327 void (*pipe_open
)(struct trace_iterator
*iter
);
328 void (*close
)(struct trace_iterator
*iter
);
329 ssize_t (*read
)(struct trace_iterator
*iter
,
330 struct file
*filp
, char __user
*ubuf
,
331 size_t cnt
, loff_t
*ppos
);
332 #ifdef CONFIG_FTRACE_STARTUP_TEST
333 int (*selftest
)(struct tracer
*trace
,
334 struct trace_array
*tr
);
336 void (*print_header
)(struct seq_file
*m
);
337 enum print_line_t (*print_line
)(struct trace_iterator
*iter
);
338 /* If you handled the flag setting, return 0 */
339 int (*set_flag
)(u32 old_flags
, u32 bit
, int set
);
342 struct tracer_flags
*flags
;
346 unsigned char buffer
[PAGE_SIZE
];
348 unsigned int readpos
;
352 * Trace iterator - used by printout routines who present trace
353 * results to users and which routines might sleep, etc:
355 struct trace_iterator
{
356 struct trace_array
*tr
;
357 struct tracer
*trace
;
359 struct ring_buffer_iter
*buffer_iter
[NR_CPUS
];
361 /* The below is zeroed out in pipe_read */
362 struct trace_seq seq
;
363 struct trace_entry
*ent
;
367 unsigned long iter_flags
;
374 int tracing_is_enabled(void);
375 void trace_wake_up(void);
376 void tracing_reset(struct trace_array
*tr
, int cpu
);
377 void tracing_reset_online_cpus(struct trace_array
*tr
);
378 int tracing_open_generic(struct inode
*inode
, struct file
*filp
);
379 struct dentry
*tracing_init_dentry(void);
380 void init_tracer_sysprof_debugfs(struct dentry
*d_tracer
);
382 struct trace_entry
*tracing_get_trace_entry(struct trace_array
*tr
,
383 struct trace_array_cpu
*data
);
384 void tracing_generic_entry_update(struct trace_entry
*entry
,
388 void ftrace(struct trace_array
*tr
,
389 struct trace_array_cpu
*data
,
391 unsigned long parent_ip
,
392 unsigned long flags
, int pc
);
393 void tracing_sched_switch_trace(struct trace_array
*tr
,
394 struct trace_array_cpu
*data
,
395 struct task_struct
*prev
,
396 struct task_struct
*next
,
397 unsigned long flags
, int pc
);
398 void tracing_record_cmdline(struct task_struct
*tsk
);
400 void tracing_sched_wakeup_trace(struct trace_array
*tr
,
401 struct trace_array_cpu
*data
,
402 struct task_struct
*wakee
,
403 struct task_struct
*cur
,
404 unsigned long flags
, int pc
);
405 void trace_special(struct trace_array
*tr
,
406 struct trace_array_cpu
*data
,
409 unsigned long arg3
, int pc
);
410 void trace_function(struct trace_array
*tr
,
411 struct trace_array_cpu
*data
,
413 unsigned long parent_ip
,
414 unsigned long flags
, int pc
);
416 void trace_graph_return(struct ftrace_graph_ret
*trace
);
417 int trace_graph_entry(struct ftrace_graph_ent
*trace
);
418 void trace_hw_branch(struct trace_array
*tr
, u64 from
, u64 to
);
420 void tracing_start_cmdline_record(void);
421 void tracing_stop_cmdline_record(void);
422 void tracing_sched_switch_assign_trace(struct trace_array
*tr
);
423 void tracing_stop_sched_switch_record(void);
424 void tracing_start_sched_switch_record(void);
425 int register_tracer(struct tracer
*type
);
426 void unregister_tracer(struct tracer
*type
);
428 extern unsigned long nsecs_to_usecs(unsigned long nsecs
);
430 extern unsigned long tracing_max_latency
;
431 extern unsigned long tracing_thresh
;
433 void update_max_tr(struct trace_array
*tr
, struct task_struct
*tsk
, int cpu
);
434 void update_max_tr_single(struct trace_array
*tr
,
435 struct task_struct
*tsk
, int cpu
);
437 extern cycle_t
ftrace_now(int cpu
);
439 #ifdef CONFIG_FUNCTION_TRACER
440 void tracing_start_function_trace(void);
441 void tracing_stop_function_trace(void);
443 # define tracing_start_function_trace() do { } while (0)
444 # define tracing_stop_function_trace() do { } while (0)
447 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
449 (*tracer_switch_func_t
)(void *private,
451 struct task_struct
*prev
,
452 struct task_struct
*next
);
454 struct tracer_switch_ops
{
455 tracer_switch_func_t func
;
457 struct tracer_switch_ops
*next
;
460 char *trace_find_cmdline(int pid
);
461 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
463 #ifdef CONFIG_DYNAMIC_FTRACE
464 extern unsigned long ftrace_update_tot_cnt
;
465 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
466 extern int DYN_FTRACE_TEST_NAME(void);
469 #ifdef CONFIG_FTRACE_STARTUP_TEST
470 extern int trace_selftest_startup_function(struct tracer
*trace
,
471 struct trace_array
*tr
);
472 extern int trace_selftest_startup_irqsoff(struct tracer
*trace
,
473 struct trace_array
*tr
);
474 extern int trace_selftest_startup_preemptoff(struct tracer
*trace
,
475 struct trace_array
*tr
);
476 extern int trace_selftest_startup_preemptirqsoff(struct tracer
*trace
,
477 struct trace_array
*tr
);
478 extern int trace_selftest_startup_wakeup(struct tracer
*trace
,
479 struct trace_array
*tr
);
480 extern int trace_selftest_startup_nop(struct tracer
*trace
,
481 struct trace_array
*tr
);
482 extern int trace_selftest_startup_sched_switch(struct tracer
*trace
,
483 struct trace_array
*tr
);
484 extern int trace_selftest_startup_sysprof(struct tracer
*trace
,
485 struct trace_array
*tr
);
486 extern int trace_selftest_startup_branch(struct tracer
*trace
,
487 struct trace_array
*tr
);
488 #endif /* CONFIG_FTRACE_STARTUP_TEST */
490 extern void *head_page(struct trace_array_cpu
*data
);
491 extern int trace_seq_printf(struct trace_seq
*s
, const char *fmt
, ...);
492 extern void trace_seq_print_cont(struct trace_seq
*s
,
493 struct trace_iterator
*iter
);
496 seq_print_ip_sym(struct trace_seq
*s
, unsigned long ip
,
497 unsigned long sym_flags
);
498 extern ssize_t
trace_seq_to_user(struct trace_seq
*s
, char __user
*ubuf
,
500 extern long ns2usecs(cycle_t nsec
);
502 trace_vprintk(unsigned long ip
, int depth
, const char *fmt
, va_list args
);
504 extern unsigned long trace_flags
;
506 /* Standard output formatting function used for function return traces */
507 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
508 extern enum print_line_t
print_graph_function(struct trace_iterator
*iter
);
510 #ifdef CONFIG_DYNAMIC_FTRACE
511 /* TODO: make this variable */
512 #define FTRACE_GRAPH_MAX_FUNCS 32
513 extern int ftrace_graph_count
;
514 extern unsigned long ftrace_graph_funcs
[FTRACE_GRAPH_MAX_FUNCS
];
516 static inline int ftrace_graph_addr(unsigned long addr
)
520 if (!ftrace_graph_count
|| test_tsk_trace_graph(current
))
523 for (i
= 0; i
< ftrace_graph_count
; i
++) {
524 if (addr
== ftrace_graph_funcs
[i
])
531 static inline int ftrace_trace_addr(unsigned long addr
)
535 static inline int ftrace_graph_addr(unsigned long addr
)
539 #endif /* CONFIG_DYNAMIC_FTRACE */
541 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
542 static inline enum print_line_t
543 print_graph_function(struct trace_iterator
*iter
)
545 return TRACE_TYPE_UNHANDLED
;
547 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
549 extern struct pid
*ftrace_pid_trace
;
551 static inline int ftrace_trace_task(struct task_struct
*task
)
553 if (!ftrace_pid_trace
)
556 return test_tsk_trace_trace(task
);
560 * trace_iterator_flags is an enumeration that defines bit
561 * positions into trace_flags that controls the output.
563 * NOTE: These bits must match the trace_options array in
566 enum trace_iterator_flags
{
567 TRACE_ITER_PRINT_PARENT
= 0x01,
568 TRACE_ITER_SYM_OFFSET
= 0x02,
569 TRACE_ITER_SYM_ADDR
= 0x04,
570 TRACE_ITER_VERBOSE
= 0x08,
571 TRACE_ITER_RAW
= 0x10,
572 TRACE_ITER_HEX
= 0x20,
573 TRACE_ITER_BIN
= 0x40,
574 TRACE_ITER_BLOCK
= 0x80,
575 TRACE_ITER_STACKTRACE
= 0x100,
576 TRACE_ITER_SCHED_TREE
= 0x200,
577 TRACE_ITER_PRINTK
= 0x400,
578 TRACE_ITER_PREEMPTONLY
= 0x800,
579 TRACE_ITER_BRANCH
= 0x1000,
580 TRACE_ITER_ANNOTATE
= 0x2000,
581 TRACE_ITER_USERSTACKTRACE
= 0x4000,
582 TRACE_ITER_SYM_USEROBJ
= 0x8000,
583 TRACE_ITER_PRINTK_MSGONLY
= 0x10000
587 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
588 * control the output of kernel symbols.
590 #define TRACE_ITER_SYM_MASK \
591 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
593 extern struct tracer nop_trace
;
596 * ftrace_preempt_disable - disable preemption scheduler safe
598 * When tracing can happen inside the scheduler, there exists
599 * cases that the tracing might happen before the need_resched
600 * flag is checked. If this happens and the tracer calls
601 * preempt_enable (after a disable), a schedule might take place
602 * causing an infinite recursion.
604 * To prevent this, we read the need_recshed flag before
605 * disabling preemption. When we want to enable preemption we
606 * check the flag, if it is set, then we call preempt_enable_no_resched.
607 * Otherwise, we call preempt_enable.
609 * The rational for doing the above is that if need resched is set
610 * and we have yet to reschedule, we are either in an atomic location
611 * (where we do not need to check for scheduling) or we are inside
612 * the scheduler and do not want to resched.
614 static inline int ftrace_preempt_disable(void)
618 resched
= need_resched();
619 preempt_disable_notrace();
625 * ftrace_preempt_enable - enable preemption scheduler safe
626 * @resched: the return value from ftrace_preempt_disable
628 * This is a scheduler safe way to enable preemption and not miss
629 * any preemption checks. The disabled saved the state of preemption.
630 * If resched is set, then we were either inside an atomic or
631 * are inside the scheduler (we would have already scheduled
632 * otherwise). In this case, we do not want to call normal
633 * preempt_enable, but preempt_enable_no_resched instead.
635 static inline void ftrace_preempt_enable(int resched
)
638 preempt_enable_no_resched_notrace();
640 preempt_enable_notrace();
643 #ifdef CONFIG_BRANCH_TRACER
644 extern int enable_branch_tracing(struct trace_array
*tr
);
645 extern void disable_branch_tracing(void);
646 static inline int trace_branch_enable(struct trace_array
*tr
)
648 if (trace_flags
& TRACE_ITER_BRANCH
)
649 return enable_branch_tracing(tr
);
652 static inline void trace_branch_disable(void)
654 /* due to races, always disable */
655 disable_branch_tracing();
658 static inline int trace_branch_enable(struct trace_array
*tr
)
662 static inline void trace_branch_disable(void)
665 #endif /* CONFIG_BRANCH_TRACER */
667 #endif /* _LINUX_KERNEL_TRACE_H */